Blasting-powder.



arren s'rn'rns PATENT orr ron.

WILLIAM A. GILL, OF TARRYTOWN, NEW YORK, ASSIGNOR TO RENDROOK POWDER COMPANY, OF NEW YORI LN. Y., A CORPORATION OF NEW 1 JERSEY.

eLnsTiNe PowDER.

' Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed January 25, 1905. Serial No. 242,669.

. fication.

- proportions.

. In carrying .My'inventionrelates particularly to that class-of explosives known as chlorate explosives and which are commonly employed for'blasting purposes, though are not limited to such use.

The compound consists in the combination, with chlorate of potash, of resin, asphalt, and wood pulp or fiber mixed together in certain out my invention 1 preferably nitrate the wood pulp or fiber and then mix the resin, asphalt, and wood fiber together and finally mix .theresultant mass with the chlorate of potash. I havefoundthat about eighteen per cent. of a low-grade commercial resin, about one per cent. of asphalt, and about one per cent. of nitrated wood pulp or fiber" constitute proportions of the foregoing ingredients which give good results, and in preparing the explosive I take the materials in the proportion of about ninety-two pounds of resin, four pounds of asphalt, and four pounds of nitrated wood fiber, mix them thoroughly, and finally mix the resultant mass with chlorate of potash or other oxygen-bearing mate- .rial in the proportion of about twenty per cent'of the resinous mixture and about-eighty per cent. of chlorate of potash. This I have found produces an inexpensive explosive of high qualities, easy to handle, safe to manufacture, and afiected by moisture to but a very small extent. The resin, asphalt, and woodpulp should be pulverized, ground, or .otherwise reduced to a fine condition and the wood pulp or fiber nitrated,washed, and dried before the said ingredients are mixed together, as above set forth. The other materials may be nitrated, if desired; but I do not deem this so necessary as the nitration of the wood pulp or fiber. The nitrating of the other ingredients, however, would tend to slightly increase the strength ofthe explosive.

While chlorate of potash will probably be employed as the oxygen-bearing material,

other oxygen-bearing materials, such as permanganate of potash, may be employed, if preferred.

in preparing the asphalt I preferably evaporate any free water contained therein before mixing it with the resin and wood pulp or fiber, as the commercial asphalt usually contains a considerable quantity of free water.

I consider it extremely advantageous to mix ouswhen-compl'eted; second, the chlorate of potash is inexplosive' by itself, as is also the combination including resin, asphalt, and hitrated wood fiber. Thus the materials do not constitute an explosive until finally combined, whereby every'step in the manufacture up to the final mixing is absolutely safe.

What I claim is f 1. An explosivetom'pound comprising ch10 'rate of potash, resin, asphalt and nitrated 2. An explosive compound comprising chlo-' rate of. potash and resin in the proportion of about four to one, together with a small quantity of asphalt and a small quantity of nitrated woodfiber.

to obtain a homogeneous mixture which may then be readily mixed with the chlorate oi.- potash, so that the whole may be homogene-= 3. An explosive compound comprising about eighty per cent. of chlorate of potash, eighteen per cent. of resln, one per cent. of asphalt, and one per cent. of nitrated wood 

